diff --git a/roots.h b/roots.h
index 46bb77e..702af8d 100644
--- a/roots.h
+++ b/roots.h
@@ -53,4 +53,6 @@
 // mounted (/tmp and /cache) are mounted.  Returns 0 on success.
 int setup_install_mounts();
 
+bool logical_partitions_mapped();
+
 #endif  // RECOVERY_ROOTS_H_